Detachable cutter blade



Jan. 10, 1956 E. F. TRINSKI 2,729,839

DETACHABLE CUTTER BLADE Filed April 2, 1952 Edmund F. Tr/ns/u' INVENTOR.

United States Patent LDET-ACHA-BLE CUTTER BLADE Edmund Trinski, EastChicago, Ind. Application April2,1952,'srial.No. 279,971.

1 .Claim. (Cl.30--286) This invention relates to a hatchet cutterbladeand particularly to a detachable cutter blade to be mountedinplaceof 'a regular blade on a hatchet for cutting roofing, la'th orother such materials.

In the operationofapplyingroof:coverings, floor coverings and such likeit is necessary to have an exceedingly sharp cutter available and forthis purpose it has been customary to use a razor-type device for doingthe cutting on the material being worked with. The cutter blade for suchmaterial must be extremely sharp and available for immediate use.Because of its sharpness and the necessity of immediate availabilitysuch blades are extremely dangerous to handle and workmen are frequentlycut when reaching for their razor blade.

The present invention provides an attachment for placing such blades ina convenient position on the normal blade of a hatchet so that it isalways available and can be operated without the necessity of handlingthe blade itself so that there is little danger of an operator beinginjured because of the blade.

This is accomplished by providing a blade seat adjacent the position ofthe normal cutting edge of a hatchet blade and mounting a razor blade onthe seat and cutting away a portion of the normal hatchet blade toexpose the proper portion of the cutter blade. The cutter blade isnormally held in position by means of a guard plate which may beattached by any suitable means so as to clamp the blade in position onthe normal hatchet blade.

It is accordingly an object of this invention to provide an improvedcutter.

It is a further object of this invention to provide an improved cuttingattachment for a hatchet.

It is a further object of this invention to provide a hatchet with arenewable cutter blade.

Other objects and many of the attendant advantages of this inventionwill be apparent from the following detailed description taken inconjunction with the accompanying drawing in which:

Figure l is an elevation of a hatchet having the cutting attachmentapplied thereto;

Figure 2 is an end view of the outside of a hatchet with the cuttingblade and guard in position;

Figure 3 is a vetrical section taken substantally on the plane indicatedby the line 33 of Figure l and showing in fragmentary section anenlarged portion of the hatchet blade showing the seat therein, theguard over the blade on the seat and a screw means for clamping theguard into contact with the blade to provide a rigid mounting therefor;

Figure 4 is a plan view of a trapezoidal blade for use in such a cutter;and

Figure 5 is a plan view of the guard plate for overlying the cutterblade to prevent injury thereto or thereby.

In the exemplarly embodiment of the invention, a hatchet is providedwith a pole 12 for driving nails or other hammering operations and hasan eye 14 for receiving a handle 16 and an upstanding blade portion 18.Such construction being normal for roofers, or lathers,

hatchets and in no way a portion of the present invention.

According tothe present'invention the blade 18 of the hatchetElSIPI'OVldBd with a cutting attachment comprising a bladeseat 20 cutinto or recessed into the face of the blade IS'adjacentth'e normalposition of the cutting edge thereof. Preferably theseat has aflat face22 and a backing face 24 substantially at right angles to the flatface'22. This produces'the 'backing face 24 at substantially rightangles to the outer face of the blade 18 and substantially parallel tothe axis of theiblade'forthe seat face 22. The seat 20 preferablyextends to and communicates with the outer edge of the blade .18 but isspaced from but in proximity to therear edge of the blade '18 so that atrapezoidal blade 26*having a longcutting edge 28 and a short back edge30 together with converging ends '32 and34:may-be mounted with'the back30 in contact with the backing face 24 andeither end 32 or 34 on aconverging end face36.

A cover plate 40 having a back edge42 is in-contact with the backing.face.24 and a diagonally extending edge 44 is in contact with the endface 36.

The blade 18 is provided with a threaded aperture 46 for receiving ascrew-threaded fastener 48. The guard plate 40 is provided with asemi-aperture 50 having an inwardly beveled edge 52 for receiving theoutwardly beveled head 54 of the screw fastener 48. As clearly shown inFigure l the threaded aperture 46 is substantially bi-sected by thebacking face 24 and the blade 26 is provided with a semi-aperture 56which may be provided wtih semi-threads 58. The device is assembled withthe blade 26 in contact with the faces 22 and 24 and the guard plate 40is placed in overlying position and the screw 48 is firmly attached inthe opening 46 so that the blade 26 is held in position and then clampedtherein by means of the overlying guard 40. The short or back edge 30 ofthe blade 26 is in contact with the backing face 24 of the plate recessso that a corner of the blade 26 extends outwardly from the outer sideof the hatchet blade 18. The hatchet blade 18 is cut away at 60 and theguard plate 40 is cut away at 62 to expose a further portion of the edgeof the blade 26.

In order to prevent injury to the major portion of the edge of the blade26 and to prevent workmen or others from being cut by the exposed edgeof the blade the guard plate 40 is extended beyond the outer edge of theblade 26 and has a turned over portion 66 which extends into proximitywith the edge 28 so that the blade is protected from accidental contactwith injurious surfaces or by contact with the operator.

The blade 26 is preferably an isosceles trapezoid so that it may beturned and either end of the edge 28 may be exposed in the cut-awayportions 60 and 62 so that the blade has a substantial double-life inuse.

In operation of the device, the blade 26 will be as.- sembled on thehatchet blade and will be available to the workman at any time the razorblade is needed. The blade 18 together with the guard 40 efficientlyprotects the blade from most injuries so that it will remain sharp andready for use when needed. Likewise, the guard protects the blade sothat there is little danger of injury to the workman or to materialadjacent where the workman is operating. Since the cutter blade ismounted on the hatchet there will be no necessity of reaching for adangerous blade when cutting operations are to be performed but 'thehatchet will be used by .merely reversing its position. It will thus beseen that the cutter blade will be available whenever needed and thatthere will be little danger of injury to the operator while using thesame.

For purposes of illustration a particular embodiment of the inventionhas been shown and described according to the best present understandingthereof. It will be apa parent to those skilled in the art that changesand modifications may be made therein without departing from the truespirit of the invention.

Having'described the invention, what is claimed as new A cutting tool ofthe type comprising a handle and a head on one end portion thereof andat right angles thereto, said head having one face thereon tapering to amarginal edge, the forward end portion of said head being cut away and arecess in the opposite face of said head extending longitudinally fromsaid forward end portion to a point in spaced relation to the rear endthereof and defining relatively angularly extending shoulders, asubstantially trapezoidal blade removably mounted in the recess inedge-abutting engagement with the shoulders and including a taperedcutting edge extending beyond said marginal edge and projectingforwardly of said head, a polygonal guard plate removably mounted in therecess on the head and abutting the shoulders, said plate having acut-away forward end portion flush with said cut-away portion of thehead for exposing the forwardly projecting portion of the blade, saidplate comprising an inwardly bent marginal flange paralleling thetapered cutting edge and closely adjacent thereto, said head having athreaded opening extending transversely therethrough in communicationwith the recess and intersecting one of the shoulders, said blade havinga threaded marginal notch therein aligned with the opening, said platehaving a tapered marginal notch therein aligned with the opening, and ascrew threadedly mounted in the opening and the first-named notch andincluding a conical head engaged in the second-named notch for clampingthe blade and the plate in the recess.

References Cited in the file of this patent UNITED STATES PATENTS821,525 Nordquist May 22, 1906 1,038,896 Jolly Mar. 15, 1948 1,424,433Angeletti Aug. 1, 1922 1,814,596 Hamel July 14, 1931 1,940,270 RainwaterDec. 19, 1933 2,304,771 Davis Dec. 8, 1942 2,437,896 Rutledge Mar. 15,1948 2,499,345 Adams Mar. 7, 1950 2,500,629 Crookston Mar. 14, 19502,686,968 Alrnlof Aug. 24, 1954 FOREIGN PATENTS 47,641 Sweden July 18;1918 431,737

Germany July 20, 1926

